fs_dblkno         197 ufs/ffs/fs.h   	int32_t	 fs_dblkno;		/* offset of first data / frags */
fs_dblkno         467 ufs/ffs/fs.h   #define	cgdmin(fs, c)	(cgstart(fs, c) + (fs)->fs_dblkno)	/* 1st data */